The impact of oligomeric anions on the speciation of protic ionic liquids

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Martins, MAR (Author) Other; Carvalho, PJ (Author) Other; Luis M N B F Santos (Author) FCUP; Pinho, SP (Author) Other; Coutinho, JAP (Author) Other

Journal

Title: Fluid Phase Equilibria

Vol. 531

ISSN: 0378-3812

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-00T-7GV

DOI: 10.1016/j.fluid.2020.112919

Abstract (EN): The synthesis of protic ionic liquids based in carboxylate anions, too often admitted as being straightforward, is actually challenging and must be carefully addressed. This review discusses the importance of oligomeric anions, in particular those based on carboxylates, in the behavior and nature of protic ionic liquids. There is strong evidence in the literature that the synthesis, and subsequent purification, of protic ionic liquids involving carboxylic acids, leads to structures in the liquid phase with an acid:base proportion different from the expected 1:1 stoichiometry. The formation of the oligomeric anions, mostly dependent on the proton transfer from the Bronsted acid to the Bronsted base, may lead to a higher ionicity that suggests the formation of true ionic liquids. It is here stressed the relevance of deepening the understanding of the interactions between the species and the speciation of the liquid phase, combining experimental and theoretical approaches to establish foundations for insightful advances in the area.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6